Split out the sign/verify functionality from the existing akcipher
interface. Most algorithms in akcipher either support encryption
and decryption, or signing and verify. Only one supports both.
As a signature algorithm may not support encryption at all, these
two should be spearated.
For now dsa is simply a wrapper around akcipher as all algorithms
remain unchanged. This is a first step and allows users to start
allocating dsa instead of akcipher.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
crypto/Kconfig | 10 ++
crypto/Makefile | 1
crypto/akcipher.c | 53 +++++++++-----
crypto/dsa.c | 159 ++++++++++++++++++++++++++++++++++++++++++
crypto/internal.h | 20 +++++
include/crypto/dsa.h | 140 ++++++++++++++++++++++++++++++++++++
include/crypto/internal/dsa.h | 17 ++++
include/linux/crypto.h | 3
8 files changed, 385 insertions(+), 18 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 8b8bb97d1d77..c3c7e1108c32 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -72,6 +72,15 @@ config CRYPTO_AEAD2
tristate
select CRYPTO_ALGAPI2
+config CRYPTO_DSA
+ tristate
+ select CRYPTO_DSA2
+ select CRYPTO_ALGAPI
+
+config CRYPTO_DSA2
+ tristate
+ select CRYPTO_ALGAPI2
+
config CRYPTO_SKCIPHER
tristate
select CRYPTO_SKCIPHER2
@@ -143,6 +152,7 @@ config CRYPTO_MANAGER2
select CRYPTO_ACOMP2
select CRYPTO_AEAD2
select CRYPTO_AKCIPHER2
+ select CRYPTO_DSA2
select CRYPTO_HASH2
select CRYPTO_KPP2
select CRYPTO_RNG2
diff --git a/crypto/Makefile b/crypto/Makefile
index 155ab671a1b4..9bdb0af75f73 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -25,6 +25,7 @@ crypto_hash-y += shash.o
obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
+obj-$(CONFIG_CRYPTO_DSA2) += dsa.o
obj-$(CONFIG_CRYPTO_KPP2) += kpp.o
dh_generic-y := dh.o
diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index 2d10b58c4010..76ab150b5df4 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -18,18 +18,7 @@
#include "internal.h"
-struct crypto_akcipher_sync_data {
- struct crypto_akcipher *tfm;
- const void *src;
- void *dst;
- unsigned int slen;
- unsigned int dlen;
-
- struct akcipher_request *req;
- struct crypto_wait cwait;
- struct scatterlist sg;
- u8 *buf;
-};
+#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
static int __maybe_unused crypto_akcipher_report(
struct sk_buff *skb, struct crypto_alg *alg)
@@ -119,7 +108,7 @@ static const struct crypto_type crypto_akcipher_type = {
.report_stat = crypto_akcipher_report_stat,
#endif
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
- .maskset = CRYPTO_ALG_TYPE_MASK,
+ .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
.type = CRYPTO_ALG_TYPE_AKCIPHER,
.tfmsize = offsetof(struct crypto_akcipher, base),
};
@@ -200,7 +189,7 @@ int akcipher_register_instance(struct crypto_template *tmpl,
}
EXPORT_SYMBOL_GPL(akcipher_register_instance);
-static int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
+int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
{
unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);
unsigned int mlen = max(data->slen, data->dlen);
@@ -223,7 +212,7 @@ static int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
data->buf = buf;
memcpy(buf, data->src, data->slen);
- sg = &data->sg;
+ sg = data->sg;
sg_init_one(sg, buf, mlen);
akcipher_request_set_crypt(req, sg, sg, data->slen, data->dlen);
@@ -233,9 +222,9 @@ static int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
return 0;
}
+EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);
-static int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data,
- int err)
+int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)
{
err = crypto_wait_req(err, &data->cwait);
memcpy(data->dst, data->buf, data->dlen);
@@ -243,6 +232,7 @@ static int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data,
kfree_sensitive(data->req);
return err;
}
+EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post);
int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,
const void *src, unsigned int slen,
@@ -281,5 +271,34 @@ int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,
}
EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt);
+static void crypto_exit_akcipher_ops_dsa(struct crypto_tfm *tfm)
+{
+ struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_akcipher(*ctx);
+}
+
+int crypto_init_akcipher_ops_dsa(struct crypto_tfm *tfm)
+{
+ struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
+ struct crypto_alg *calg = tfm->__crt_alg;
+ struct crypto_akcipher *akcipher;
+
+ if (!crypto_mod_get(calg))
+ return -EAGAIN;
+
+ akcipher = crypto_create_tfm(calg, &crypto_akcipher_type);
+ if (IS_ERR(akcipher)) {
+ crypto_mod_put(calg);
+ return PTR_ERR(akcipher);
+ }
+
+ *ctx = akcipher;
+ tfm->exit = crypto_exit_akcipher_ops_dsa;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_dsa);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic public key cipher type");
diff --git a/crypto/dsa.c b/crypto/dsa.c
new file mode 100644
index 000000000000..36ea2d0828b1
--- /dev/null
+++ b/crypto/dsa.c
@@ -0,0 +1,159 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Digital Signature Algorithm
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <crypto/akcipher.h>
+#include <crypto/internal/dsa.h>
+#include <linux/cryptouser.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <net/netlink.h>
+
+#include "internal.h"
+
+#define CRYPTO_ALG_TYPE_DSA_MASK 0x0000000e
+
+static const struct crypto_type crypto_dsa_type;
+
+static inline struct crypto_dsa *__crypto_dsa_tfm(struct crypto_tfm *tfm)
+{
+ return container_of(tfm, struct crypto_dsa, base);
+}
+
+static int crypto_dsa_init_tfm(struct crypto_tfm *tfm)
+{
+ if (tfm->__crt_alg->cra_type != &crypto_dsa_type)
+ return crypto_init_akcipher_ops_dsa(tfm);
+
+ return 0;
+}
+
+static void __maybe_unused crypto_dsa_show(struct seq_file *m,
+ struct crypto_alg *alg)
+{
+ seq_puts(m, "type : dsa\n");
+}
+
+static int __maybe_unused crypto_dsa_report(struct sk_buff *skb,
+ struct crypto_alg *alg)
+{
+ struct crypto_report_akcipher rdsa = {};
+
+ strscpy(rdsa.type, "dsa", sizeof(rdsa.type));
+
+ return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rdsa), &rdsa);
+}
+
+static int __maybe_unused crypto_dsa_report_stat(struct sk_buff *skb,
+ struct crypto_alg *alg)
+{
+ struct crypto_stat_akcipher rdsa = {};
+
+ strscpy(rdsa.type, "dsa", sizeof(rdsa.type));
+
+ return nla_put(skb, CRYPTOCFGA_STAT_AKCIPHER, sizeof(rdsa), &rdsa);
+}
+
+static const struct crypto_type crypto_dsa_type = {
+ .extsize = crypto_alg_extsize,
+ .init_tfm = crypto_dsa_init_tfm,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_dsa_show,
+#endif
+#if IS_ENABLED(CONFIG_CRYPTO_USER)
+ .report = crypto_dsa_report,
+#endif
+#ifdef CONFIG_CRYPTO_STATS
+ .report_stat = crypto_dsa_report_stat,
+#endif
+ .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+ .maskset = CRYPTO_ALG_TYPE_DSA_MASK,
+ .type = CRYPTO_ALG_TYPE_DSA,
+ .tfmsize = offsetof(struct crypto_dsa, base),
+};
+
+struct crypto_dsa *crypto_alloc_dsa(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_alloc_tfm(alg_name, &crypto_dsa_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_dsa);
+
+int crypto_dsa_maxsize(struct crypto_dsa *tfm)
+{
+ struct crypto_akcipher **ctx = crypto_dsa_ctx(tfm);
+
+ return crypto_akcipher_maxsize(*ctx);
+}
+EXPORT_SYMBOL_GPL(crypto_dsa_maxsize);
+
+int crypto_dsa_sign(struct crypto_dsa *tfm,
+ const void *src, unsigned int slen,
+ void *dst, unsigned int dlen)
+{
+ struct crypto_akcipher **ctx = crypto_dsa_ctx(tfm);
+ struct crypto_akcipher_sync_data data = {
+ .tfm = *ctx,
+ .src = src,
+ .dst = dst,
+ .slen = slen,
+ .dlen = dlen,
+ };
+
+ return crypto_akcipher_sync_prep(&data) ?:
+ crypto_akcipher_sync_post(&data,
+ crypto_akcipher_sign(data.req));
+}
+EXPORT_SYMBOL_GPL(crypto_dsa_sign);
+
+int crypto_dsa_verify(struct crypto_dsa *tfm,
+ const void *src, unsigned int slen,
+ const void *digest, unsigned int dlen)
+{
+ struct crypto_akcipher **ctx = crypto_dsa_ctx(tfm);
+ struct crypto_akcipher_sync_data data = {
+ .tfm = *ctx,
+ .src = src,
+ .slen = slen,
+ .dlen = dlen,
+ };
+ int err;
+
+ err = crypto_akcipher_sync_prep(&data);
+ if (err)
+ return err;
+
+ sg_init_table(data.sg, 2);
+ sg_set_buf(&data.sg[0], src, slen);
+ sg_set_buf(&data.sg[1], digest, dlen);
+
+ return crypto_akcipher_sync_post(&data,
+ crypto_akcipher_verify(data.req));
+}
+EXPORT_SYMBOL_GPL(crypto_dsa_verify);
+
+int crypto_dsa_set_pubkey(struct crypto_dsa *tfm,
+ const void *key, unsigned int keylen)
+{
+ struct crypto_akcipher **ctx = crypto_dsa_ctx(tfm);
+
+ return crypto_akcipher_set_pub_key(*ctx, key, keylen);
+}
+EXPORT_SYMBOL_GPL(crypto_dsa_set_pubkey);
+
+int crypto_dsa_set_privkey(struct crypto_dsa *tfm,
+ const void *key, unsigned int keylen)
+{
+ struct crypto_akcipher **ctx = crypto_dsa_ctx(tfm);
+
+ return crypto_akcipher_set_priv_key(*ctx, key, keylen);
+}
+EXPORT_SYMBOL_GPL(crypto_dsa_set_privkey);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Digital Signature Algorithms");
diff --git a/crypto/internal.h b/crypto/internal.h
index 8dd746b1130b..024c2c795f59 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -18,9 +18,12 @@
#include <linux/numa.h>
#include <linux/refcount.h>
#include <linux/rwsem.h>
+#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/types.h>
+struct akcipher_request;
+struct crypto_akcipher;
struct crypto_instance;
struct crypto_template;
@@ -32,6 +35,19 @@ struct crypto_larval {
bool test_started;
};
+struct crypto_akcipher_sync_data {
+ struct crypto_akcipher *tfm;
+ const void *src;
+ void *dst;
+ unsigned int slen;
+ unsigned int dlen;
+
+ struct akcipher_request *req;
+ struct crypto_wait cwait;
+ struct scatterlist sg[2];
+ u8 *buf;
+};
+
enum {
CRYPTOA_UNSPEC,
CRYPTOA_ALG,
@@ -109,6 +125,10 @@ void *crypto_create_tfm_node(struct crypto_alg *alg,
void *crypto_clone_tfm(const struct crypto_type *frontend,
struct crypto_tfm *otfm);
+int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data);
+int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err);
+int crypto_init_akcipher_ops_dsa(struct crypto_tfm *tfm);
+
static inline void *crypto_create_tfm(struct crypto_alg *alg,
const struct crypto_type *frontend)
{
diff --git a/include/crypto/dsa.h b/include/crypto/dsa.h
new file mode 100644
index 000000000000..98ce39e9d054
--- /dev/null
+++ b/include/crypto/dsa.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Digital Signature Algorithm
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
+ */
+#ifndef _CRYPTO_DSA_H
+#define _CRYPTO_DSA_H
+
+#include <linux/crypto.h>
+
+/**
+ * struct crypto_dsa - user-instantiated objects which encapsulate
+ * algorithms and core processing logic
+ *
+ * @base: Common crypto API algorithm data structure
+ */
+struct crypto_dsa {
+ struct crypto_tfm base;
+};
+
+/**
+ * DOC: Generic Digital Signature API
+ *
+ * The Digital Signature API is used with the algorithms of type
+ * CRYPTO_ALG_TYPE_DSA (listed as type "dsa" in /proc/crypto)
+ */
+
+/**
+ * crypto_alloc_dsa() - allocate DSA tfm handle
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ * signing algorithm e.g. "ecdsa"
+ * @type: specifies the type of the algorithm
+ * @mask: specifies the mask for the algorithm
+ *
+ * Allocate a handle for digital signature algorithm. The returned struct
+ * crypto_dsa is the handle that is required for any subsequent
+ * API invocation for signature operations.
+ *
+ * Return: allocated handle in case of success; IS_ERR() is true in case
+ * of an error, PTR_ERR() returns the error code.
+ */
+struct crypto_dsa *crypto_alloc_dsa(const char *alg_name, u32 type, u32 mask);
+
+static inline struct crypto_tfm *crypto_dsa_tfm(struct crypto_dsa *tfm)
+{
+ return &tfm->base;
+}
+
+/**
+ * crypto_free_dsa() - free DSA tfm handle
+ *
+ * @tfm: DSA tfm handle allocated with crypto_alloc_dsa()
+ *
+ * If @tfm is a NULL or error pointer, this function does nothing.
+ */
+static inline void crypto_free_dsa(struct crypto_dsa *tfm)
+{
+ crypto_destroy_tfm(tfm, crypto_dsa_tfm(tfm));
+}
+
+/**
+ * crypto_dsa_maxsize() - Get len for output buffer
+ *
+ * Function returns the dest buffer size required for a given key.
+ * Function assumes that the key is already set in the transformation. If this
+ * function is called without a setkey or with a failed setkey, you will end up
+ * in a NULL dereference.
+ *
+ * @tfm: DSA tfm handle allocated with crypto_alloc_dsa()
+ */
+int crypto_dsa_maxsize(struct crypto_dsa *tfm);
+
+/**
+ * crypto_dsa_sign() - Invoke signing operation
+ *
+ * Function invokes the specific signing operation for a given DSA
+ *
+ * @tfm: DSA tfm handle allocated with crypto_alloc_dsa()
+ * @src: source buffer
+ * @slen: source length
+ * @dst: destinatino obuffer
+ * @dlen: destination length
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_dsa_sign(struct crypto_dsa *tfm,
+ const void *src, unsigned int slen,
+ void *dst, unsigned int dlen);
+
+/**
+ * crypto_dsa_verify() - Invoke signature verification
+ *
+ * Function invokes the specific signature verification operation
+ * for a given DSA.
+ *
+ * @tfm: DSA tfm handle allocated with crypto_alloc_dsa()
+ * @src: source buffer
+ * @slen: source length
+ * @digest: digest
+ * @dlen: digest length
+ *
+ * Return: zero on verification success; error code in case of error.
+ */
+int crypto_dsa_verify(struct crypto_dsa *tfm,
+ const void *src, unsigned int slen,
+ const void *digest, unsigned int dlen);
+
+/**
+ * crypto_dsa_set_pubkey() - Invoke set public key operation
+ *
+ * Function invokes the algorithm specific set key function, which knows
+ * how to decode and interpret the encoded key and parameters
+ *
+ * @tfm: tfm handle
+ * @key: BER encoded public key, algo OID, paramlen, BER encoded
+ * parameters
+ * @keylen: length of the key (not including other data)
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_dsa_set_pubkey(struct crypto_dsa *tfm,
+ const void *key, unsigned int keylen);
+
+/**
+ * crypto_dsa_set_privkey() - Invoke set private key operation
+ *
+ * Function invokes the algorithm specific set key function, which knows
+ * how to decode and interpret the encoded key and parameters
+ *
+ * @tfm: tfm handle
+ * @key: BER encoded private key, algo OID, paramlen, BER encoded
+ * parameters
+ * @keylen: length of the key (not including other data)
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_dsa_set_privkey(struct crypto_dsa *tfm,
+ const void *key, unsigned int keylen);
+#endif
diff --git a/include/crypto/internal/dsa.h b/include/crypto/internal/dsa.h
new file mode 100644
index 000000000000..5586551693e4
--- /dev/null
+++ b/include/crypto/internal/dsa.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Digital Signature Algorithm
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
+ */
+#ifndef _CRYPTO_INTERNAL_DSA_H
+#define _CRYPTO_INTERNAL_DSA_H
+
+#include <crypto/algapi.h>
+#include <crypto/dsa.h>
+
+static inline void *crypto_dsa_ctx(struct crypto_dsa *tfm)
+{
+ return crypto_tfm_ctx(&tfm->base);
+}
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index fa310ac1db59..fbf3139c11f0 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -25,11 +25,12 @@
#define CRYPTO_ALG_TYPE_COMPRESS 0x00000002
#define CRYPTO_ALG_TYPE_AEAD 0x00000003
#define CRYPTO_ALG_TYPE_SKCIPHER 0x00000005
+#define CRYPTO_ALG_TYPE_AKCIPHER 0x00000006
+#define CRYPTO_ALG_TYPE_DSA 0x00000007
#define CRYPTO_ALG_TYPE_KPP 0x00000008
#define CRYPTO_ALG_TYPE_ACOMPRESS 0x0000000a
#define CRYPTO_ALG_TYPE_SCOMPRESS 0x0000000b
#define CRYPTO_ALG_TYPE_RNG 0x0000000c
-#define CRYPTO_ALG_TYPE_AKCIPHER 0x0000000d
#define CRYPTO_ALG_TYPE_HASH 0x0000000e
#define CRYPTO_ALG_TYPE_SHASH 0x0000000e
#define CRYPTO_ALG_TYPE_AHASH 0x0000000f
